| Monthly Observation SummarySeptember 1998 | |||||||||||||
| Station "APLMD" (JHU/Applied Physics Laboratory), Laurel, MD (39°10'02"N, 76°53'52"W, 438 ft) | |||||||||||||
| Day | Max. Temp. | Min. Temp. | Rain Day | Rain Month | Rain Year | Max. Rn Rate | Peak Gust | Max. Light | Last Light | Min. Press. | Max. Press. | Min. RH | Max. RH |
| (°F) | (°F) | (in.) | (in.) | (in.) | (in./hr) | (mph) | (in.) | (in.) | (%) | (%) | |||
| 1 | 85 | 64 | 0.00 | 0.00 | 32.34 | 0.00 | 12 | 79 | 19:53 | 29.90 | 30.02 | 37 | 84 |
| 2 | 90 | 66 | 0.00 | 0.00 | 32.34 | 0.00 | 16 | 76 | 19:53 | 29.73 | 29.90 | 33 | 90 |
| 3 | 85 | 60 | 0.00 | 0.00 | 32.34 | 0.00 | 17 | 77 | 19:48 | 29.85 | 29.96 | 40 | 94 |
| 4 | 86 | 66 | 0.00 | 0.00 | 32.34 | 0.00 | 21 | 78 | 19:51 | 29.82 | 30.01 | 28 | 92 |
| 5 | 84 | 62 | 0.00 | 0.00 | 32.34 | 0.00 | 17 | 78 | 19:50 | 30.01 | 30.24 | 27 | 77 |
| 6 | 95 | 57 | 0.00 | 0.00 | 32.34 | 0.00 | 16 | 78 | 19:46 | 29.91 | 30.18 | 26 | 91 |
| 7 | 92 | 69 | 0.35 | 0.35 | 32.69 | 0.40 | 29 | 76 | 19:35 | 29.62 | 29.93 | 32 | 94 |
| 8 | 72 | 56 | 0.08 | 0.43 | 32.77 | 0.12 | 33 | 79 | 19:42 | 29.63 | 29.85 | 37 | 96 |
| 9 | 72 | 51 | 0.00 | 0.43 | 32.77 | 0.00 | 28 | 79 | 19:38 | 29.85 | 30.07 | 35 | 85 |
| 10 | 75 | 53 | 0.00 | 0.43 | 32.77 | 0.00 | 27 | 78 | 19:41 | 30.07 | 30.20 | 32 | 82 |
| 11 | 84 | 58 | 0.00 | 0.43 | 32.77 | 0.00 | 14 | 78 | 19:39 | 29.99 | 30.16 | 26 | 74 |
| 12 | 92 | 69 | 0.00 | 0.43 | 32.77 | 0.00 | 18 | 77 | 19:38 | 29.90 | 30.04 | 22 | 56 |
| 13 | 89 | 69 | 0.00 | 0.43 | 32.77 | 0.00 | 13 | 76 | 19:35 | 29.95 | 30.09 | 39 | 86 |
| 14 | 92 | 65 | 0.00 | 0.43 | 32.77 | 0.00 | 18 | 76 | 19:31 | 30.07 | 30.20 | 35 | 99 |
| 15 | 92 | 66 | 0.00 | 0.43 | 32.77 | 0.00 | 16 | 76 | 19:28 | 30.07 | 30.18 | 40 | 96 |
| 16 | 92 | 72 | 0.00 | 0.43 | 32.77 | 0.00 | 16 | 77 | 19:29 | 30.02 | 30.16 | 36 | 85 |
| 17 | 86 | 68 | 0.05 | 0.48 | 32.82 | 0.16 | 19 | 75 | 19:24 | 30.02 | 30.12 | 55 | 95 |
| 18 | 83 | 67 | 0.01 | 0.49 | 32.83 | 0.04 | 12 | 76 | 19:27 | 30.04 | 30.15 | 50 | 96 |
| 19 | 82 | 65 | 0.00 | 0.49 | 32.83 | 0.00 | 11 | 75 | 19:26 | 30.02 | 30.13 | 56 | 96 |
| 20 | 85 | 64 | 0.00 | 0.49 | 32.83 | 0.00 | 11 | 75 | 19:23 | 29.96 | 30.09 | 53 | 98 |
| 21 | 92 | 64 | 0.05 | 0.54 | 32.88 | 0.04 | 16 | 76 | 19:15 | 29.88 | 30.01 | 40 | 99 |
| 22 | 83 | 65 | 0.21 | 0.75 | 33.09 | 0.48 | 28 | 75 | 19:22 | 29.80 | 29.95 | 61 | 98 |
| 23 | 67 | 47 | 0.00 | 0.75 | 33.09 | 0.00 | 23 | 77 | 19:21 | 29.95 | 30.23 | 31 | 89 |
| 24 | 74 | 43 | 0.00 | 0.75 | 33.09 | 0.00 | 19 | 77 | 19:16 | 30.16 | 30.31 | 33 | 98 |
| 25 | 67 | 55 | 0.05 | 0.80 | 33.14 | 0.12 | 11 | 74 | 19:13 | 30.12 | 30.24 | 72 | 96 |
| 26 | 88 | 59 | 0.00 | 0.80 | 33.14 | 0.00 | 13 | 76 | 19:15 | 30.05 | 30.23 | 47 | 100 |
| 27 | 95 | 70 | 0.00 | 0.80 | 33.14 | 0.00 | 22 | 76 | 19:13 | 29.82 | 30.05 | 26 | 87 |
| 28 | 82 | 58 | 0.00 | 0.80 | 33.14 | 0.00 | 22 | 75 | 19:12 | 29.84 | 30.05 | 37 | 79 |
| 29 | 78 | 52 | 0.00 | 0.80 | 33.14 | 0.00 | 13 | 74 | 19:09 | 30.01 | 30.15 | 35 | 87 |
| 30 | 86 | 60 | 0.00 | 0.80 | 33.14 | 0.00 | 16 | 76 | 19:06 | 29.84 | 30.02 | 46 | 93 |
| Avg. | 84.2 | 61.3 | |||||||||||
| Max. | 95 | 0.35 | 0.48 | 33 | 79 | 30.31 | 72 | 100 | |||||
| Min. | 43 | 11 | 74 | 29.62 | 22 | 56 | |||||||